Rio Formoso in September
6.7out of 10
Possible, with caveats
Warm and comfortable: highs around 28°C. Very wet: about 18 rainy days.
28°CAvg high
21°CAvg low
18Rainy days (54 mm)
11:57 hDaylight
05:16Sunrise · 17:14 Sunset
Why this score
- Warm and comfortable: highs around 28°C
- Very wet: about 18 rainy days
- Rain varies a lot between years (±5.0 days)
What to wear and pack
- T-shirts and light layers
- Shorts or a light skirt
- Rain jacket or compact umbrella
How reliable is the forecast?
Rain in September varies a lot between years (±5.0 rainy days), so check the forecast closer to your trip. Averages cover 30 years (1991–2020). Individual days can differ a lot.
Year at a glance
Weather by month
| Month | Avg high | Avg low | Rainfall | Rainy days | Humidity | Sunshine | Score |
|---|---|---|---|---|---|---|---|
| January | 30°C | 24°C | 56 mm | 17 | – | – | 6.4 |
| February | 31°C | 24°C | 61 mm | 17 | – | – | 6.4 |
| March | 31°C | 24°C | 80 mm | 19 | – | – | 6.0 |
| April | 30°C | 23°C | 93 mm | 21 | – | – | 5.9 |
| May | 29°C | 23°C | 123 mm | 24 | – | – | 6.1 |
| June | 27°C | 22°C | 142 mm | 25 | – | – | 6.1 |
| July | 27°C | 21°C | 123 mm | 25 | – | – | 6.1 |
| August | 27°C | 21°C | 78 mm | 22 | – | – | 6.1 |
| September | 28°C | 21°C | 54 mm | 18 | – | – | 6.7 |
| October | 29°C | 22°C | 38 mm | 15 | – | – | 7.1 |
| November | 30°C | 23°C | 30 mm | 11 | – | – | 7.4 |
| December | 30°C | 23°C | 32 mm | 13 | – | – | 7.0 |
Frequently asked questions
How hot is Rio Formoso in September?
Daytime highs average 28°C and nights about 21°C.
When is the best time to visit Rio Formoso?
The best months are November, October, December.